Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Qual país tem um PIB (nominal) de $29,9 bilhões?
 ###Tabelas: CREATE TABLE current_members_of_the_howard_county_delegation (current_members_of_the_howard_county_delegation_id AUTO_INCREMENT PRIMARY KEY, District VARCHAR, Counties Represented VARCHAR, Delegate VARCHAR, Party VARCHAR, First Elected INT, Committee VARCHAR) CREATE TABLE formation_of_the_1st_arkansas_state_troops (formation_of_the_1st_arkansas_state_troops_id AUTO_INCREMENT PRIMARY KEY, Company VARCHAR, Name VARCHAR, County VARCHAR, Militia Regiment VARCHAR, Commander VARCHAR, Organization Date VARCHAR) CREATE TABLE major_sports_teams (major_sports_teams_id AUTO_INCREMENT PRIMARY KEY, Club VARCHAR, Sport VARCHAR, League VARCHAR, Venue VARCHAR, Championships (Years) VARCHAR) CREATE TABLE prospective_members (prospective_members_id AUTO_INCREMENT PRIMARY KEY, Country VARCHAR, Population VARCHAR, Area (km²) VARCHAR, GDP (nominal) VARCHAR, GDP per capita (nominal) VARCHAR) CREATE TABLE the_2011_season (the_2011_season_id AUTO_INCREMENT PRIMARY KEY, Position INT, Driver / Passenger VARCHAR, Equipment VARCHAR, Bike No INT, Points INT)  
SELECT Country FROM prospective_members WHERE GDP (nominal) = $29.9 billion